CN113774725A - Preparation method of white paperboard containing graphene heat conduction layer and having good ink absorption - Google Patents
Preparation method of white paperboard containing graphene heat conduction layer and having good ink absorption Download PDFInfo
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- CN113774725A CN113774725A CN202110980363.6A CN202110980363A CN113774725A CN 113774725 A CN113774725 A CN 113774725A CN 202110980363 A CN202110980363 A CN 202110980363A CN 113774725 A CN113774725 A CN 113774725A
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 94
- 229910021389 graphene Inorganic materials 0.000 title claims abstract description 94
- 238000002360 preparation method Methods 0.000 title claims abstract description 23
- 238000010521 absorption reaction Methods 0.000 title claims abstract description 13
- 239000011087 paperboard Substances 0.000 title claims description 8
- 239000010410 layer Substances 0.000 claims abstract description 44
- 239000002344 surface layer Substances 0.000 claims abstract description 41
- 238000000034 method Methods 0.000 claims abstract description 24
- 238000000967 suction filtration Methods 0.000 claims abstract description 23
- 238000001035 drying Methods 0.000 claims abstract description 20
- 238000004513 sizing Methods 0.000 claims abstract description 10
- 238000004519 manufacturing process Methods 0.000 claims abstract description 8
- 238000013329 compounding Methods 0.000 claims abstract description 7
- 239000011248 coating agent Substances 0.000 claims abstract description 4
- 238000000576 coating method Methods 0.000 claims abstract description 4
- 238000007493 shaping process Methods 0.000 claims abstract description 4
- 239000000123 paper Substances 0.000 claims description 171
- 239000012792 core layer Substances 0.000 claims description 39
- 239000007788 liquid Substances 0.000 claims description 27
- 239000006185 dispersion Substances 0.000 claims description 26
- 230000002159 abnormal effect Effects 0.000 claims description 21
- 239000012528 membrane Substances 0.000 claims description 19
- 239000002002 slurry Substances 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 238000010438 heat treatment Methods 0.000 claims description 11
- 239000007787 solid Substances 0.000 claims description 11
- 238000003825 pressing Methods 0.000 claims description 9
- 238000001704 evaporation Methods 0.000 claims description 7
- 238000000465 moulding Methods 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 6
- 239000008367 deionised water Substances 0.000 claims description 5
- 229910021641 deionized water Inorganic materials 0.000 claims description 5
- 239000000725 suspension Substances 0.000 claims description 5
- 238000009210 therapy by ultrasound Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 238000007865 diluting Methods 0.000 claims description 3
- 230000008020 evaporation Effects 0.000 claims description 3
- 238000007710 freezing Methods 0.000 claims description 3
- 230000008014 freezing Effects 0.000 claims description 3
- 239000003292 glue Substances 0.000 claims description 3
- 238000007602 hot air drying Methods 0.000 claims description 3
- 239000011261 inert gas Substances 0.000 claims description 3
- 230000001678 irradiating effect Effects 0.000 claims description 3
- 230000002045 lasting effect Effects 0.000 claims description 3
- 239000012466 permeate Substances 0.000 claims description 3
- 238000003490 calendering Methods 0.000 claims description 2
- 239000005002 finish coating Substances 0.000 claims description 2
- 238000007639 printing Methods 0.000 abstract description 2
- 238000003828 vacuum filtration Methods 0.000 abstract description 2
- 239000011259 mixed solution Substances 0.000 description 8
- 238000002156 mixing Methods 0.000 description 8
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- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 4
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- 238000010009 beating Methods 0.000 description 4
- 238000004537 pulping Methods 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 241001397809 Hakea leucoptera Species 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000010790 dilution Methods 0.000 description 2
- 239000012895 dilution Substances 0.000 description 2
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- 239000000835 fiber Substances 0.000 description 2
- 229910021382 natural graphite Inorganic materials 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 239000012286 potassium permanganate Substances 0.000 description 2
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 description 2
- 235000010344 sodium nitrate Nutrition 0.000 description 2
- 239000004317 sodium nitrate Substances 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 229920001131 Pulp (paper) Polymers 0.000 description 1
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- 230000003115 biocidal effect Effects 0.000 description 1
- 239000011111 cardboard Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 235000015220 hamburgers Nutrition 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
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- 230000009467 reduction Effects 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 229910001961 silver nitrate Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/30—Multi-ply
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/15—Nano-sized carbon materials
- C01B32/182—Graphene
- C01B32/198—Graphene oxide
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
- D21F3/02—Wet presses
- D21F3/08—Pressure rolls
- D21F3/083—Pressure rolls perforated
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
- D21H13/10—Organic non-cellulose fibres
- D21H13/12—Organic non-cellulose fibres from macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H13/14—Polyalkenes, e.g. polystyrene polyethylene
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/50—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by form
- D21H21/52—Additives of definite length or shape
- D21H21/54—Additives of definite length or shape being spherical, e.g. microcapsules, beads
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/22—Addition to the formed paper
- D21H23/32—Addition to the formed paper by contacting paper with an excess of material, e.g. from a reservoir or in a manner necessitating removal of applied excess material from the paper
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/22—Addition to the formed paper
- D21H23/70—Multistep processes; Apparatus for adding one or several substances in portions or in various ways to the paper, not covered by another single group of this main group
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
- D21H25/04—Physical treatment, e.g. heating, irradiating
- D21H25/06—Physical treatment, e.g. heating, irradiating of impregnated or coated paper
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/30—Measuring arrangements characterised by the use of optical techniques for measuring roughness or irregularity of surfaces
Landscapes
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Organic Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Nanotechnology (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Fluid Mechanics (AREA)
- Paper (AREA)
Abstract
The invention discloses a preparation method of white board paper containing a graphene heat conduction layer and having good ink absorption, which comprises the following steps: step 1: preparing a graphene permeable core paper layer and a graphene permeable surface paper layer; step 2: sizing; and step 3: forming and squeezing a graphene permeable core paper layer and a graphene permeable surface paper layer through two-layer net stacking; stripping to form base paper; and 4, step 4: detecting the surface property of the base paper; and 5: compounding the base paper to form an oil paper layer; step 6: surface sizing and coating are carried out on the base paper passing through the step 5; and 7: drying and shaping; the method comprises the following steps of adsorbing graphene oxide on an inner-layer paper base of white board paper in a vacuum filtration mode; graphene on the surface layer and the inner layer is redistributed due to the suction filtration mode, and the release uniformity of the graphene is improved; in addition, the surface shape of the inner paper base during production is detected in real time; the printing surface performance is improved; and has good three-dimensional thermal conductivity.
Description
Technical Field
The invention relates to the technical field of white board paper manufacturing, in particular to a preparation method of white board paper containing a graphene heat conduction layer and having good ink absorption.
Background
In our daily life, there are different requirements for paper, and the development of special paper industry is promoted, such as special properties of acid resistance, antibiosis, and oleophobic property. On the other hand, the demand of paper in life is large, so that research and production of special paper become a popular industry and research hotspot. The consumption of the special paper and the paperboard is continuously increasing for three years, and the special paper and the paperboard are far ahead of the growth rate of other paper types, and particularly under the condition of bad industrial conditions, the cultural paper with negative growth needs to be converted into the special paper.
In the society with faster and faster life rhythm, fast food culture is extremely prevalent in our cities, in the life style of young people, fast sales, e-commerce and takeout have deeply lived, hamburgers and fast food restaurants are visible anywhere in streets and shopping malls, meanwhile, 2000 cities across the country have been covered by hungry, 130 trillion restaurants are franchised, the user quantity reaches 2.6 billion, and the market is wide. Logistics and treasure panning promote the development of cardboard paper, and I believe that take-out platforms such as hungry and American groups also have requirements and demands on the packaging materials of fast-heating foods. There are many unknown possibilities of graphene, which is called "king of new materials", as a new material, and the paper industry is a traditional industry that is inherited over thousands of years, and needs support of new technologies to realize sustainable development. Although the graphene material still has the difficulties of higher preparation cost and the like in the actual production, with the breakthrough of scientific technology and the mutual cooperation among industries, the development of the special paper based on the graphene material has bright prospect.
However, in the prior art, most of the graphene films are graphene films; the method is mainly applied to the field of semiconductors; as disclosed in patent 201410361337.5; silver-doped graphene composite paper and a preparation method thereof; the preparation method comprises the steps of preparing graphene oxide, and carrying out ultrasonic treatment on the graphene oxide to prepare a graphene oxide suspension; adding silver nitrate into the graphene oxide suspension to obtain a mixed solution; evaporating the mixed solution to obtain silver-doped graphene oxide composite paper; putting the silver-doped graphene oxide composite paper into a solution containing a reducing agent for reduction treatment to obtain silver-doped graphene composite paper; the composite paper can not be directly used as special paper in the packaging industry; the graphene is directly mixed in the paper pulp to prepare the composite special paper, and the paper has the defects that: the distribution of graphene in the paper is very uneven; as a result, after the product is made into a carton or other products, local heating of the product is uneven, and the graphene material cannot be fully utilized.
In order to solve the above problems, research needs to be carried out to provide a preparation method of white board paper containing a graphene heat conduction layer and having good ink absorption, so that the white board paper can be heated quickly and uniformly and has high paper quality.
Disclosure of Invention
The invention aims to provide a preparation method of white board paper which contains a graphene heat conduction layer and has good ink absorption, and the preparation method is used for solving the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
the preparation method of the white paperboard containing the graphene heat conduction layer and having good ink absorption comprises the following steps:
step 1: preparing a graphene permeable core paper layer and a graphene permeable surface paper layer; the method specifically comprises the following substeps:
a1, preparing core layer slurry and surface layer slurry; respectively feeding the core layer slurry and the surface layer slurry into a flow box to form a core layer wet paper base and a surface layer wet paper base; pre-pressing the core layer wet paper base and the surface layer wet paper base by adopting a barbed pressing roller to ensure that the water content of the paper bases is 60-65%; meanwhile, holes which are uniformly distributed are formed on the surfaces of the core layer wet paper base and the surface layer wet paper base after squeezing;
a2, attaching graphene oxide dispersion liquid, namely performing ultrasonic treatment on the graphene oxide dispersion liquid to obtain uniformly dispersed graphene suspension liquid, and conveying the pre-pressed core layer wet paper base and the surface layer wet paper base in the step A1 to a graphene oxide dispersion liquid pool; respectively attaching the solution in the graphene oxide dispersion liquid pool to the core layer wet paper base and the surface layer wet paper base; pre-evaporating and drying the paper base after the attachment is finished; improving the tension of the core layer wet paper base and the surface layer wet paper base; the wet paper base of the core layer is 64 to 68 percent after pre-evaporation and drying; and the moisture content of the surface layer wet paper base is 68-72 percent;
a3, compounding the core layer wet paper base and the surface layer wet paper base in the step A2 with a microporous filter membrane respectively; the aperture of the microporous filter membrane is 0.02-2 mu m, the microporous filter membrane and the surface layer wet paper base are compounded and then are respectively sent into a suction filtration device, and the graphene oxide dispersion liquid at the top of the core layer wet paper base and the surface layer wet paper base partially permeates into the paper base from holes on the surface of the paper base and the back of the paper base;
step 2: sizing one side of the core layer wet paper base without the microporous filter membrane;
and step 3: forming a graphene permeable core paper layer and a graphene permeable surface paper layer through two-layer net stacking; when in molding; the microporous filter membrane compounded by the two faces outwards; pressing after molding; simultaneously stripping off the filter membrane layer and carrying out front-section drying to form base paper; wherein, in the post-squeezing process, the roller shaft is heated, the heating temperature is 60-85 ℃, and the applied pressure is 75-100 Mpa;
and 4, step 4: detecting the surface property of the base paper, and judging the surface flatness of the base paper; if the surface is uneven, adjusting parameters in the previous procedure;
and 5: compounding the base paper to form an oil paper layer;
step 6: surface sizing the base paper passing through step 5; the glue application amount is 1-2g/m2Then, carrying out back-stage drying; after the completion of the latter stage dryingCalendering; and entering a coating system to finish coating;
and 7: and (5) drying and shaping the paper coated in the step 6 through a hot air drying box.
The preparation method of the core layer pulp comprises the steps of mixing the coniferous wood and the broadleaf wood according to the mass ratio of 3:7, defibering, adding water and pulping to obtain the pulp; the concentration of the slurry is 15-18%, and the beating degree is 30-40 DEG SR. The preparation method of the surface layer sizing agent comprises the following steps of mixing high-elasticity polyethylene fibers, water-absorbent resin particles, needle wood and broad leaf wood in a proportion of 6: 5: mixing according to the mass ratio of 3: 7; defibering, adding water and pulping to obtain pulp; the concentration of the slurry is 11-15%, and the beating degree is 25-30 DEG SR. Wherein the particle diameter of the water-absorbent resin particles is 100-120 mu m.
Preferably, the method for detecting the surface property of the base paper and judging the surface flatness of the base paper in the step 5 comprises the following substeps:
s1, taking the standard sample paper base, irradiating with a standard light source;
s2, shooting a surface character image of the sample paper base through a high-definition camera device; extracting the edge of the sample paper base and converting the edge into a standard gray value image;
s3, under the premise of irradiation of the same standard light source; acquiring a surface character image of an actual paper base through an online camera device; extracting the actual paper base edge and converting the actual paper base edge into an actual gray value image; establishing a position coordinate system on the actual gray value image; taking one end point of the actual gray value image as a reference point, and taking the width direction of the actual gray value image as an X axis; taking the length direction of the actual gray value image as a Y axis;
s4, corresponding the actual gray value image and the standard gray value image to a coordinate system one by one;
s5 selecting a pixel of the actual gray image with a gray value of G0The average gray value G of the standard gray value image is compared with the average gray value G of the standard gray value imagetComparing, if the obtained difference absolute value GnIf the gray value is less than or equal to 5, taking the changed point as the gray value of the pixel of the reference point, and performing difference comparison operation on the gray value of the pixel of the adjacent point and the gray value of the pixel of the reference point to obtain a difference absolute value T1; and recording the comparison quantityIs S1; if T1 is less than or equal to 10; recording the gray value of the adjacent point; if T1 is more than 10, discarding the gray value of the adjacent point; repeating the steps until all the pixel points with the difference absolute value less than or equal to 10 are found; and adjusting the gray value of the pixel points to the average gray value GtThe same; if G is obtained for the first timenIs more than 5; then look again until G is foundnA point no more than 5;
s6, carrying out AND operation on the actual gray value image and the standard gray value image to obtain pixel points which are different from the standard gray value image in the actual gray value image; simultaneously obtaining the gray value after the AND operation;
s7, marking the outer contour of each abnormal area; and determining a coordinate region of the abnormal region: thereby obtaining the actual position of the abnormal occurrence; the process parameters can be conveniently adjusted in the actual production line subsequently; the method for determining the coordinate area comprises the following steps: taking the outermost edge points of the upper, lower, left and right sides of the abnormal area as tangent points, making a tangent line, and determining the range occupied by the abnormal area by using coordinates of the tangent line;
s8, judging whether the abnormal area is concave or convex; the central point of the abnormal area is taken as the center of a circle and is radiated outwards in a circle; marking pixel points with the gray value larger than 0 and smaller than 0 after the AND operation respectively; determining that the area formed by the pixel points with the gray value greater than 0 after the AND operation is sunken; and judging the area formed by the pixel points with the gray value less than 0 after the AND operation as the bulge.
Preferably, the suction filtration device comprises a conveying platform, a suction filtration box body is transversely arranged along the conveying platform, and the suction filtration box body is connected with a suction filtration pump; a plurality of suction filtration channels are arranged between the suction filtration box body and the top of the conveying platform; and carrying out suction filtration on the wet paper base through the suction filtration channel.
Preferably, the preparation method of the graphene oxide dispersion liquid comprises the following steps:
(a) taking solid graphene oxide; heating solid graphene oxide in an environment of: heating to 1000-1300 ℃ at the speed of 80-200 ℃/min; lasting for 20min-35min, and rapidly cooling;
(b) and dispersing the solid graphene oxide subjected to quick freezing in deionized water, and dispersing and diluting by using an ultrasonic instrument to obtain 0.05-5mg/mL graphene oxide dispersion liquid.
Wherein the dispersion and dilution time of the ultrasonic instrument is 0.9-1.5H; and obtaining the stable graphene oxide dispersion liquid.
Preferably, in the step (a), the temperature is rapidly reduced to 140-280 ℃ below zero in 10-25s under an inert gas environment.
The preparation method of the solid graphene oxide comprises the following steps:
mixing natural graphite and sodium nitrate uniformly, adding concentrated sulfuric acid, stirring for 10-150 min, then adding potassium permanganate, and continuing stirring for 10-150 min to obtain a mixed solution;
transferring the mixed solution into a constant-temperature water bath at the temperature of 20-40 ℃, and stirring for reaction for 15-180 min; adding deionized water into the mixed solution, reacting for 30-60 min, then raising the temperature of the constant-temperature water bath at 20-40 ℃ to 80-100 ℃, and stirring for 30-300 min; and finally, adding hydrogen peroxide, reacting for 30-90 min, washing and drying to obtain the graphene oxide.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a preparation method of white board paper containing a graphene heat conduction layer and having good ink absorption, and the application of the white board paper
Adsorbing graphene oxide on an inner-layer paper base of the white board paper in a vacuum filtration mode; the aim of uniformly releasing the graphene is fulfilled; meanwhile, graphene on the surface layer and the inner layer is redistributed due to the suction filtration mode; the release uniformity of the graphene is further improved; in addition, the surface shape of the inner paper base during production is detected in real time; the printing surface performance is improved; and has a small impurity content, good three-dimensional thermal conductivity, high tensile strength and good anisotropic extensibility.
Drawings
FIG. 1 is a schematic view of a white paperboard structure of the present invention
Fig. 2 is a schematic structural diagram of the suction filtration device of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Referring to fig. 1-2, the present invention provides a technical solution:
the preparation method of the white paperboard containing the graphene heat conduction layer and having good ink absorption comprises the following steps:
step 1: preparing a graphene permeable core layer paper layer 1 and a graphene permeable surface layer paper layer 2; the method specifically comprises the following substeps:
a1, preparing core layer slurry and surface layer slurry; respectively feeding the core layer slurry and the surface layer slurry into a flow box to form a core layer wet paper base and a surface layer wet paper base; pre-pressing the core layer wet paper base and the surface layer wet paper base by adopting a barbed pressing roller to ensure that the water content of the paper bases is 60-65%; meanwhile, holes which are uniformly distributed are formed on the surfaces of the core layer wet paper base and the surface layer wet paper base after squeezing;
a2, attaching graphene oxide dispersion liquid, namely performing ultrasonic treatment on the graphene oxide dispersion liquid to obtain uniformly dispersed graphene suspension liquid, and conveying the pre-pressed core layer wet paper base and the surface layer wet paper base in the step A1 to a graphene oxide dispersion liquid pool; respectively attaching the solution in the graphene oxide dispersion liquid pool to the core layer wet paper base and the surface layer wet paper base; pre-evaporating and drying the paper base after the attachment is finished; improving the tension of the core layer wet paper base and the surface layer wet paper base; the wet paper base of the core layer is 64 to 68 percent after pre-evaporation and drying; and the moisture content of the surface layer wet paper base is 68-72 percent;
a3, compounding the core layer wet paper base and the surface layer wet paper base in the step A2 with a microporous filter membrane respectively; the aperture of the microporous filter membrane is 0.02-2 mu m, the microporous filter membrane and the surface layer wet paper base are compounded and then are respectively sent into a suction filtration device, and the graphene oxide dispersion liquid at the top of the core layer wet paper base and the surface layer wet paper base partially permeates into the paper base from holes on the surface of the paper base and the back of the paper base;
during suction filtration, the graphene dispersion liquid attached to the paper base flows uniformly along the pores of the filter membrane under the action of suction; so that the graphene is redistributed and a uniform graphene layer is formed on the surface of the paper base.
Step 2: sizing one side of the core layer wet paper base without the microporous filter membrane;
and step 3: forming a graphene permeable core paper layer and a graphene permeable surface paper layer through two-layer net stacking; when in molding; the microporous filter membrane compounded by the two faces outwards; pressing after molding; simultaneously stripping off the filter membrane layer and carrying out front-section drying to form base paper; wherein, in the post-squeezing process, the roller shaft is heated, the heating temperature is 60-85 ℃, and the applied pressure is 75-100 Mpa;
and 4, step 4: detecting the surface property of the base paper, and judging the surface flatness of the base paper; if the surface is uneven, adjusting parameters in the previous procedure;
and 5: compounding the base paper to form an oil paper layer 3;
step 6: surface sizing the base paper passing through step 5; the glue application amount is 1-2g/m2Then, carrying out back-stage drying; calendering is carried out after the rear section drying is finished; and enters the coating system to finish the coating layer 4;
and 7: and (5) drying and shaping the paper coated in the step 6 through a hot air drying box.
The preparation method of the core layer pulp comprises the steps of mixing the coniferous wood and the broadleaf wood according to the mass ratio of 3:7, defibering, adding water and pulping to obtain the pulp; the concentration of the slurry is 15-18%, and the beating degree is 30-40 DEG SR. The preparation method of the surface layer sizing agent comprises the following steps of mixing high-elasticity polyethylene fibers, water-absorbent resin particles, needle wood and broad leaf wood in a proportion of 6: 5: mixing according to the mass ratio of 3: 7; defibering, adding water and pulping to obtain pulp; the concentration of the slurry is 11-15%, and the beating degree is 25-30 DEG SR. Wherein the particle diameter of the water-absorbent resin particles is 100-120 mu m.
Wherein; the method for detecting the surface property of the base paper and judging the surface evenness of the base paper in the step 5 comprises the following substeps:
s1, taking the standard sample paper base, irradiating with a standard light source;
s2, shooting a surface character image of the sample paper base through a high-definition camera device; extracting the edge of the sample paper base and converting the edge into a standard gray value image;
s3, under the premise of irradiation of the same standard light source; acquiring a surface character image of an actual paper base through an online camera device; extracting the actual paper base edge and converting the actual paper base edge into an actual gray value image; establishing a position coordinate system on the actual gray value image; taking one end point of the actual gray value image as a reference point, and taking the width direction of the actual gray value image as an X axis; taking the length direction of the actual gray value image as a Y axis;
s4, corresponding the actual gray value image and the standard gray value image to a coordinate system one by one;
s5 selecting a pixel of the actual gray image with a gray value of G0The average gray value G of the standard gray value image is compared with the average gray value G of the standard gray value imagetComparing, if the obtained difference absolute value GnIf the gray value is less than or equal to 5, taking the changed point as the gray value of the pixel of the reference point, and performing difference comparison operation on the gray value of the pixel of the adjacent point and the gray value of the pixel of the reference point to obtain a difference absolute value T1; and recording the comparison quantity as S1; if T1 is less than or equal to 10; recording the gray value of the adjacent point; if T1 is more than 10, discarding the gray value of the adjacent point; repeating the steps until all the pixel points with the difference absolute value less than or equal to 10 are found; and adjusting the gray value of the pixel points to the average gray value GtThe same; if G is obtained for the first timenIs more than 5; then look again until G is foundnA point no more than 5;
s6, carrying out AND operation on the actual gray value image and the standard gray value image to obtain pixel points which are different from the standard gray value image in the actual gray value image; simultaneously obtaining the gray value after the AND operation;
s7, marking the outer contour of each abnormal area; and determining a coordinate region of the abnormal region: thereby obtaining the actual position of the abnormal occurrence; the process parameters can be conveniently adjusted in the actual production line subsequently; the method for determining the coordinate area comprises the following steps: taking the outermost edge points of the upper, lower, left and right sides of the abnormal area as tangent points, making a tangent line, and determining the range occupied by the abnormal area by using coordinates of the tangent line;
s8, judging whether the abnormal area is concave or convex; the central point of the abnormal area is taken as the center of a circle and is radiated outwards in a circle; marking pixel points with the gray value larger than 0 and smaller than 0 after the AND operation respectively; determining that the area formed by the pixel points with the gray value greater than 0 after the AND operation is sunken; and judging the area formed by the pixel points with the gray value less than 0 after the AND operation as the bulge.
The suction filtration device comprises a conveying platform 5, a suction filtration box body 6 is arranged along the transverse direction of the conveying platform, and the suction filtration box body is connected with a suction filtration pump; a plurality of suction filtration channels are arranged between the suction filtration box body and the top of the conveying platform; and carrying out suction filtration on the wet paper base through the suction filtration channel.
The preparation method of the graphene oxide dispersion liquid comprises the following steps:
(a) taking solid graphene oxide; heating solid graphene oxide in an environment of: heating to 1000-1300 ℃ at the speed of 80-200 ℃/min; lasting for 20min-35min, and rapidly cooling;
(b) and dispersing the solid graphene oxide subjected to quick freezing in deionized water, and dispersing and diluting by using an ultrasonic instrument to obtain 0.05-5mg/mL graphene oxide dispersion liquid.
Wherein the dispersion and dilution time of the ultrasonic instrument is 0.9-1.5H; and obtaining the stable graphene oxide dispersion liquid.
In the step (a), the temperature is rapidly reduced to 140-280 ℃ below zero in 10-25s under the inert gas environment.
The preparation method of the solid graphene oxide comprises the following steps:
mixing natural graphite and sodium nitrate uniformly, adding concentrated sulfuric acid, stirring for 10-150 min, then adding potassium permanganate, and continuing stirring for 10-150 min to obtain a mixed solution;
transferring the mixed solution into a constant-temperature water bath at the temperature of 20-40 ℃, and stirring for reaction for 15-180 min; adding deionized water into the mixed solution, reacting for 30-60 min, then raising the temperature of the constant-temperature water bath at 20-40 ℃ to 80-100 ℃, and stirring for 30-300 min; and finally, adding hydrogen peroxide, reacting for 30-90 min, washing and drying to obtain the graphene oxide.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. The preparation method of the white paperboard containing the graphene heat conduction layer and having good ink absorption is characterized by comprising the following steps of: the method comprises the following steps:
step 1: preparing a graphene permeable core paper layer and a graphene permeable surface paper layer; the method specifically comprises the following substeps:
a1, preparing core layer slurry and surface layer slurry; respectively feeding the core layer slurry and the surface layer slurry into a flow box to form a core layer wet paper base and a surface layer wet paper base; pre-pressing the core layer wet paper base and the surface layer wet paper base by adopting a barbed pressing roller to ensure that the water content of the paper bases is 60-65%; meanwhile, holes which are uniformly distributed are formed on the surfaces of the core layer wet paper base and the surface layer wet paper base after squeezing;
a2, attaching graphene oxide dispersion liquid, namely performing ultrasonic treatment on the graphene oxide dispersion liquid to obtain uniformly dispersed graphene suspension liquid, and conveying the pre-pressed core layer wet paper base and the surface layer wet paper base in the step A1 to a graphene oxide dispersion liquid pool; respectively attaching the solution in the graphene oxide dispersion liquid pool to the core layer wet paper base and the surface layer wet paper base; pre-evaporating and drying the paper base after the attachment is finished; improving the tension of the core layer wet paper base and the surface layer wet paper base; the wet paper base of the core layer is 64 to 68 percent after pre-evaporation and drying; and the moisture content of the surface layer wet paper base is 68-72 percent;
a3, compounding the core layer wet paper base and the surface layer wet paper base in the step A2 with a microporous filter membrane respectively; the aperture of the microporous filter membrane is 0.02-2 mu m, the microporous filter membrane and the surface layer wet paper base are compounded and then are respectively sent into a suction filtration device, and the graphene oxide dispersion liquid at the top of the core layer wet paper base and the surface layer wet paper base partially permeates into the paper base from holes on the surface of the paper base and the back of the paper base;
step 2: sizing one side of the core layer wet paper base without the microporous filter membrane;
and step 3: forming a graphene permeable core paper layer and a graphene permeable surface paper layer through two-layer net stacking; when in molding; the microporous filter membrane compounded by the two faces outwards; pressing after molding; simultaneously stripping off the filter membrane layer and carrying out front-section drying to form base paper; wherein, in the post-squeezing process, the roller shaft is heated, the heating temperature is 60-85 ℃, and the applied pressure is 75-100 Mpa;
and 4, step 4: detecting the surface property of the base paper, and judging the surface flatness of the base paper; if the surface is uneven, adjusting parameters in the previous procedure;
and 5: compounding the base paper to form an oil paper layer;
step 6: surface sizing the base paper passing through step 5; the glue application amount is 1-2g/m2Then, carrying out back-stage drying; calendering is carried out after the rear section drying is finished; and entering a coating system to finish coating;
and 7: and (5) drying and shaping the paper coated in the step 6 through a hot air drying box.
2. The method for preparing the white board paper containing the graphene heat conduction layer and having good ink absorption property according to claim 1, is characterized in that: the method for detecting the surface property of the base paper and judging the surface evenness of the base paper in the step 5 comprises the following substeps:
s1, taking the standard sample paper base, irradiating with a standard light source;
s2, shooting a surface character image of the sample paper base through a high-definition camera device; extracting the edge of the sample paper base and converting the edge into a standard gray value image;
s3, under the premise of irradiation of the same standard light source; acquiring a surface character image of an actual paper base through an online camera device; extracting the actual paper base edge and converting the actual paper base edge into an actual gray value image; establishing a position coordinate system on the actual gray value image; taking one end point of the actual gray value image as a reference point, and taking the width direction of the actual gray value image as an X axis; taking the length direction of the actual gray value image as a Y axis;
s4, corresponding the actual gray value image and the standard gray value image to a coordinate system one by one;
s5 selecting a pixel of the actual gray image with a gray value of G0The average gray value G of the standard gray value image is compared with the average gray value G of the standard gray value imagetComparing, if the obtained difference absolute value GnIf the gray value is less than or equal to 5, taking the changed point as the gray value of the pixel of the reference point, and performing difference comparison operation on the gray value of the pixel of the adjacent point and the gray value of the pixel of the reference point to obtain a difference absolute value T1; and recording the comparison quantity as S1; if T1 is less than or equal to 10; recording the gray value of the adjacent point; if T1 is more than 10, discarding the gray value of the adjacent point; repeating the steps until all the pixel points with the difference absolute value less than or equal to 10 are found; and adjusting the gray value of the pixel points to the average gray value GtThe same; if G is obtained for the first timenIs more than 5; then look again until G is foundnA point no more than 5;
s6, carrying out AND operation on the actual gray value image and the standard gray value image to obtain pixel points which are different from the standard gray value image in the actual gray value image; simultaneously obtaining the gray value after the AND operation;
s7, marking the outer contour of each abnormal area; and determining a coordinate region of the abnormal region: thereby obtaining the actual position of the abnormal occurrence; the process parameters can be conveniently adjusted in the actual production line subsequently; the method for determining the coordinate area comprises the following steps: taking the outermost edge points of the upper, lower, left and right sides of the abnormal area as tangent points, making a tangent line, and determining the range occupied by the abnormal area by using coordinates of the tangent line;
s8, judging whether the abnormal area is concave or convex; the central point of the abnormal area is taken as the center of a circle and is radiated outwards in a circle; marking pixel points with the gray value larger than 0 and smaller than 0 after the AND operation respectively; determining that the area formed by the pixel points with the gray value greater than 0 after the AND operation is sunken; and judging the area formed by the pixel points with the gray value less than 0 after the AND operation as the bulge.
3. The method for preparing the white board paper containing the graphene heat conduction layer and having good ink absorption property according to claim 1 or 2, is characterized in that: the preparation method of the graphene oxide dispersion liquid comprises the following steps:
(a) taking solid graphene oxide; heating solid graphene oxide in an environment of: heating to 1000-1300 ℃ at the speed of 80-200 ℃/min; lasting for 20min-35min, and rapidly cooling;
(b) and dispersing the solid graphene oxide subjected to quick freezing in deionized water, and dispersing and diluting by using an ultrasonic instrument to obtain 0.05-5mg/mL graphene oxide dispersion liquid.
4. The method for preparing the white board paper containing the graphene heat conduction layer and having good ink absorption property according to claim 3, is characterized in that: in the step (a), the temperature is rapidly reduced to 140-280 ℃ below zero in 10-25s under the inert gas environment.
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Denomination of invention: Preparation Method of White Board Paper with Graphene Thermal Conductive Layer and Good Ink Absorption Granted publication date: 20230110 Pledgee: Bank of Jinhua Limited by Share Ltd. Wucheng branch Pledgor: ZHEJIANG JINHUA DINGDING INDUSTRIAL Co.,Ltd. Registration number: Y2024980036968 |